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p ...Q1-titel? talles afmtt IMPROVEMENT IN'fSTEAM-ENGINE SLIDEj-VALVES.

i @te Stiga-111e maar tu iu lgcst italics ateut mit mating piatti tige sama TO ALL WHOM IT MAY CONCERN y l l I Be itV known that I, ALBERT STALEY, ofthe city and county of Clinton, in the-State of Iowa, have invented a certain new and useful Improvement in Balancing the Slidc-Valvcsof Steam Engines; and I de hereby declare thatl the following is a full and cnactdescription thereof, reference being had to the accompanying drawings, making part of this` specification, in whichA l i Figure 1 is a central verticalrscction of a valve-cl est-and my improved valve.

4`Figure 2 is a Aplan of the inner surface of the diskv E. g y

`Figure?) is a seetionalperspective view of a portion of the disk E andmeliefvalve S. VLikelctters of reference designate corresponding'parts in all the gures.

My invention consists in the combination and arrangementof a disk on the outside of the valvefchest, attached to a stem or shank of any'ordinary slide-valve, and reciprocating with it, the inner portion Aof the surface of the diskcontiguous to the valve-chest being recessed, so as to afford space for the steam, which, by

pressing outward against the disk, balances the valve, the perimeter of said disk being provided with packingrings, to prevent the escape ofthe steam between the former and the valve-chest, all as hereinafter particularly l set forth.

In the drawings, A represents a valve-chest provided withthe usual ports, m ma. B, a slide-valve, with 'rods -C C for actuating it. E is a disk secured on the end of .a stem, d, ou the outside of the valve-chest, by a Vnutgj', or other suitable means. The stemd may be cast with the valve, and passes through a slot, a, in the top or outer plate of thevvalvc-chcs't, which allows it to reciprocate with the valve. The area of the disk E is designed to beeo'rual to that of the valve, or a little less, a'nd is recessed on the under-side, or side contiguous to;

the vnlvc-chesu'asshown"at b, to afford a. narrow space for the steam, which, passing through slota, presses against the surface of the disk in a direction opposite from that of the valve-seat. This pressure, by counter actingthat on the valve, relicvcs'the pressure upon the valvc-seat and balances the valve. .To prevent the escape'of thestcam from the space I), between the disk and surface ofthe valve-chest,-I-construct the disk with a concentric Vrectangular groove in its face, near the outer edge, in which are fitted two metallic rings, e g, with an intervening one,-z`, efibrcus or elastic packing material. Narrow passages c c are formed from the recess b to vthe bottoni ot.v this groeve beneath the rings, through which the steam enters, and by pressing the rings against thc contiguous surfacelof the valve-chest, insuresa reliable packing at all times. Y

The disk may be made of circular, rectangular, or other suitable form, as may be preferred, its functions and mode of 4operating remaining the same. i

The great advantage of my improvement is that it relieves the pressure of the valve on its seat, and consequently from the wear between those surfaces which would otherwise result.

Should the ringg become worn out from the friction between it and the valve-chest, it can readily be replaced by a new one, at a tritling cost, by simply unscrewing nut f and removing the disk. The disk E is also provided with one or more oil-ducts, closed by suitable valves S, for lubricating the friction surface ofthe steam-chest.

. What I claim as my invention, is

The balancing disk E, of circular or other :formon the outside of the valve-chest, provided with packing' c ig, in combination with the valve B and stem cl, to which the said disk is attached, substantially in the manner and for the purpose set forth.

Y In witness whereof I have hereunto signed my name in the presence of two subscribing Witnesses.

ALBERT sTaLEY.

Witnesses: i

H. S. HYATT, C. VAN KURAN. 

